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/*
* Copyright (c) 2011-2012 The Chromium OS Authors.
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __SANDBOX_STATE_H
#define __SANDBOX_STATE_H
#include <config.h>
#include <stdbool.h>
#include <linux/stringify.h>
/* How we exited U-Boot */
enum exit_type_id {
STATE_EXIT_NORMAL,
STATE_EXIT_COLD_REBOOT,
STATE_EXIT_POWER_OFF,
};
struct sandbox_spi_info {
const char *spec;
const struct sandbox_spi_emu_ops *ops;
};
/* The complete state of the test system */
struct sandbox_state {
const char *cmd; /* Command to execute */
bool interactive; /* Enable cmdline after execute */
const char *fdt_fname; /* Filename of FDT binary */
enum exit_type_id exit_type; /* How we exited U-Boot */
const char *parse_err; /* Error to report from parsing */
int argc; /* Program arguments */
char **argv;
uint8_t *ram_buf; /* Emulated RAM buffer */
unsigned int ram_size; /* Size of RAM buffer */
const char *ram_buf_fname; /* Filename to use for RAM buffer */
bool write_ram_buf; /* Write RAM buffer on exit */
const char *state_fname; /* File containing sandbox state */
void *state_fdt; /* Holds saved state for sandbox */
bool read_state; /* Read sandbox state on startup */
bool write_state; /* Write sandbox state on exit */
bool ignore_missing_state_on_read; /* No error if state missing */
/* Pointer to information for each SPI bus/cs */
struct sandbox_spi_info spi[CONFIG_SANDBOX_SPI_MAX_BUS]
[CONFIG_SANDBOX_SPI_MAX_CS];
};
/* Minimum space we guarantee in the state FDT when calling read/write*/
#define SANDBOX_STATE_MIN_SPACE 0x1000
/**
* struct sandbox_state_io - methods to saved/restore sandbox state
* @name: Name of of the device tree node, also the name of the variable
* holding this data so it should be an identifier (use underscore
* instead of minus)
* @compat: Compatible string for the node containing this state
*
* @read: Function to read state from FDT
* If data is available, then blob and node will provide access to it. If
* not (blob == NULL and node == -1) this function should set up an empty
* data set for start-of-day.
* @param blob: Pointer to device tree blob, or NULL if no data to read
* @param node: Node offset to read from
* @return 0 if OK, -ve on error
*
* @write: Function to write state to FDT
* The caller will ensure that there is a node ready for the state. The
* node may already contain the old state, in which case it should be
* overridden. There is guaranteed to be SANDBOX_STATE_MIN_SPACE bytes
* of free space, so error checking is not required for fdt_setprop...()
* calls which add up to less than this much space.
*
* For adding larger properties, use state_setprop().
*
* @param blob: Device tree blob holding state
* @param node: Node to write our state into
*
* Note that it is possible to save data as large blobs or as individual
* hierarchical properties. However, unless you intend to keep state files
* around for a long time and be able to run an old state file on a new
* sandbox, it might not be worth using individual properties for everything.
* This is certainly supported, it is just a matter of the effort you wish
* to put into the state read/write feature.
*/
struct sandbox_state_io {
const char *name;
const char *compat;
int (*write)(void *blob, int node);
int (*read)(const void *blob, int node);
};
/**
* SANDBOX_STATE_IO - Declare sandbox state to read/write
*
* Sandbox permits saving state from one run and restoring it in another. This
* allows the test system to retain state between runs and thus better
* emulate a real system. Examples of state that might be useful to save are
* the emulated GPIOs pin settings, flash memory contents and TPM private
* data. U-Boot memory contents is dealth with separately since it is large
* and it is not normally useful to save it (since a normal system does not
* preserve DRAM between runs). See the '-m' option for this.
*
* See struct sandbox_state_io above for member documentation.
*/
#define SANDBOX_STATE_IO(_name, _compat, _read, _write) \
ll_entry_declare(struct sandbox_state_io, _name, state_io) = { \
.name = __stringify(_name), \
.read = _read, \
.write = _write, \
.compat = _compat, \
}
/**
* Record the exit type to be reported by the test program.
*
* @param exit_type Exit type to record
*/
void state_record_exit(enum exit_type_id exit_type);
/**
* Gets a pointer to the current state.
*
* @return pointer to state
*/
struct sandbox_state *state_get_current(void);
/**
* Read the sandbox state from the supplied device tree file
*
* This calls all registered state handlers to read in the sandbox state
* from a previous test run.
*
* @param state Sandbox state to update
* @param fname Filename of device tree file to read from
* @return 0 if OK, -ve on error
*/
int sandbox_read_state(struct sandbox_state *state, const char *fname);
/**
* Write the sandbox state to the supplied device tree file
*
* This calls all registered state handlers to write out the sandbox state
* so that it can be preserved for a future test run.
*
* If the file exists it is overwritten.
*
* @param state Sandbox state to update
* @param fname Filename of device tree file to write to
* @return 0 if OK, -ve on error
*/
int sandbox_write_state(struct sandbox_state *state, const char *fname);
/**
* Add a property to a sandbox state node
*
* This is equivalent to fdt_setprop except that it automatically enlarges
* the device tree if necessary. That means it is safe to write any amount
* of data here.
*
* This function can only be called from within struct sandbox_state_io's
* ->write method, i.e. within state I/O drivers.
*
* @param node Device tree node to write to
* @param prop_name Property to write
* @param data Data to write into property
* @param size Size of data to write into property
*/
int state_setprop(int node, const char *prop_name, const void *data, int size);
/**
* Initialize the test system state
*/
int state_init(void);
/**
* Uninitialize the test system state, writing out state if configured to
* do so.
*
* @return 0 if OK, -ve on error
*/
int state_uninit(void);
#endif
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